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Mo

th

erboard

P5QL/EPU

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ii

E4277

First Edition V1December 2008

Copyright 2008 ASUSTeK Computer, Inc. All Rights Reserved.

No part of this manual, including the products and software described in it, may be reproduced,transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by anymeans, except documentation kept by the purchaser for backup purposes, without the express writtenpermission of ASUSTeK Computer Inc. (ASUS).

Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless

such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of theproduct is defaced or missing.

ASUS PROVIDES THIS MANUAL AS IS WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSOR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OFMERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITSDIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANYDEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FORINFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,

AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NORESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THISMANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.

Products and corporate names appearing in this manual may or may not be registered trademarks orcopyrights of their respective companies, and are used only for identication or explanation and to theowners benet, without intent to infringe.

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iii

Contents

Notices ......................................................................................................... vi

Safety information ..................................................................................... vii

About this guide ........................................................................................ vii

P5QL/EPU specications summary.......................................................... ix

Chapter 1Product introduction

1.1 Welcome! ...................................................................................... 1-1

1.2 Package contents......................................................................... 1-1

1.3 Special features............................................................................ 1-1

1.3.1 Product highlights ........................................................... 1-1

1.3.2 ASUS unique features .................................................... 1-2

1.3.3 ASUS Stylish features ..................................................... 1-3

1.3.4 ASUS Intelligent Overclocking features .......................... 1-3

1.4 Before you proceed ..................................................................... 1-4

1.5 Motherboard overview ................................................................. 1-5

1.5.1 Placement direction ........................................................ 1-5

1.5.2 Screw holes .................................................................... 1-5

1.5.3 Motherboard layout ......................................................... 1-6

1.5.4 Layout contents ............................................................... 1-71.6 Central Processing Unit (CPU) ................................................... 1-7

1.6.1 Installing the CPU ........................................................... 1-8

1.6.2 Installing the CPU heatsink and fan .............................. 1-10

1.6.3 Uninstalling the CPU heatsink and fan ..........................1-11

1.7 System memory ......................................................................... 1-11

1.7.1 Overview ........................................................................1-11

1.7.2 Memory congurations.................................................. 1-12

1.7.3 Installing a DIMM .......................................................... 1-16

1.7.4 Removing a DIMM ........................................................ 1-16

1.8 Expansion slots.......................................................................... 1-17

1.8.1 Installing an expansion card ......................................... 1-17

1.8.2 Conguring an expansion card..................................... 1-17

1.8.4 PCI slots ........................................................................ 1-17

1.8.5 PCI Express x1 slots ..................................................... 1-17

1.8.6 PCI Express x16 slot ..................................................... 1-17

1.9 Jumper ........................................................................................ 1-18

1.10 Connectors ................................................................................. 1-19

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iv

Contents1.10.1 Rear panel connectors .................................................. 1-19

1.10.2 Internal connectors ....................................................... 1-20

1.11 Software support ........................................................................ 1-27

1.11.1 Installing an operating system ...................................... 1-271.11.2 Support DVD information .............................................. 1-27

Chapter 2BIOS information

2.1 Managing and updating your BIOS ............................................ 2-1

2.1.1 ASUS Update utility ........................................................ 2-1

2.1.2 Creating a bootable oppy disk....................................... 2-2

2.1.3 ASUS EZ Flash 2 utility ................................................... 2-3

2.1.4 AFUDOS utility ................................................................ 2-4

2.1.5 ASUS CrashFree BIOS 3 utility ...................................... 2-5

2.2 BIOS setup program .................................................................... 2-7

2.2.1 BIOS menu screen .......................................................... 2-8

2.2.2 Menu bar ......................................................................... 2-8

2.2.3 Navigation keys ............................................................... 2-8

2.2.4 Menu items ..................................................................... 2-9

2.2.5 Sub-menu items .............................................................. 2-92.2.6 Conguration elds......................................................... 2-9

2.2.7 Pop-up window ............................................................... 2-9

2.2.8 Scroll bar ......................................................................... 2-9

2.2.9 General help ................................................................... 2-9

2.3 Main menu .................................................................................. 2-10

2.3.1 System Time ................................................................. 2-10

2.3.2 System Date ................................................................. 2-10

2.3.3 Legacy Diskette A ......................................................... 2-10

2.3.4 SATA 1-6 ..........................................................................................2-10

2.3.5 Storage Conguration ....................................................2-11

2.3.6 System Information ........................................................2-11

2.4 Ai Tweaker menu ........................................................................ 2-12

2.5 Advanced menu ......................................................................... 2-14

2.5.1 CPU Conguration........................................................ 2-14

2.5.2 Chipset .......................................................................... 2-15

2.5.3 Onboard Devices Conguration.................................... 2-16

2.5.4 USB Conguration........................................................ 2-17

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v

Contents2.5.5 PCI PnP ........................................................................ 2-17

2.6 Power menu ................................................................................ 2-18

2.6.1 Suspend Mode .............................................................. 2-18

2.6.2 ACPI 2.0 Support .......................................................... 2-182.6.3 ACPI APIC Support ....................................................... 2-18

2.6.4 APM Conguration ........................................................2-19

2.6.5 Hardware Monitor ......................................................... 2-19

2.7 Boot menu .................................................................................. 2-21

2.7.1 Boot Device Priority ...................................................... 2-21

2.7.2 Boot Settings Conguration.......................................... 2-21

2.7.3 Security ......................................................................... 2-22

2.8 Tools menu ................................................................................. 2-23

2.8.1 ASUS EZ Flash 2 .......................................................... 2-23

2.8.2 Express Gate ................................................................ 2-23

2.8.3 AI NET 2........................................................................ 2-24

2.8.4 ASUS O.C. Prole......................................................... 2-24

2.9 Exit menu .................................................................................... 2-24

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vi

Notices

Federal Communications Commission Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two

conditions:

This device may not cause harmful interference, and

This device must accept any interference received including interference that may causeundesired operation.

This equipment has been tested and found to comply with the limits for a Class B digitaldevice, pursuant to Part 15 of the FCC Rules. These limits are designed to providereasonable protection against harmful interference in a residential installation. This

equipment generates, uses and can radiate radio frequency energy and, if not installedand used in accordance with manufacturers instructions, may cause harmful interference

to radio communications. However, there is no guarantee that interference will not occurin a particular installation. If this equipment does cause harmful interference to radio ortelevision reception, which can be determined by turning the equipment off and on, the useris encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment to an outlet on a circuit different from that to which the receiver is

connected.

Consult the dealer or an experienced radio/TV technician for help.

Canadian Department of Communications Statement

This digital apparatus does not exceed the Class B limits for radio noise emissions fromdigital apparatus set out in the Radio Interference Regulations of the Canadian Departmentof Communications.

This class B digital apparatus complies with Canadian ICES-003.

The use of shielded cables for connection of the monitor to the graphics card is requiredto assure compliance with FCC regulations. Changes or modications to this unit notexpressly approved by the party responsible for compliance could void the users authorityto operate this equipment.

DO NOTthrow the motherboard in municipal waste. This product has been designed toenable proper reuse of parts and recycling. This symbol of the crossed out wheeled binindicates that the product (electrical and electronic equipment) should not be placed in

municipal waste. Check local regulations for disposal of electronic products.

DO NOT throw the mercury-containing button cell battery in municipal waste. This symbolof the crossed out wheeled bin indicates that the battery should not be placed in municipalwaste.

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vii

Safety information

Electrical safety

To prevent electrical shock hazard, disconnect the power cable from the electrical outlet

before relocating the system.

When adding or removing devices to or from the system, ensure that the power cablesfor the devices are unplugged before the signal cables are connected. If possible,disconnect all power cables from the existing system before you add a device.

Before connecting or removing signal cables from the motherboard, ensure that allpower cables are unplugged.

Seek professional assistance before using an adpater or extension cord. These devices

could interrupt the grounding circuit.

Make sure that your power supply is set to the correct voltage in your area. If you are

not sure about the voltage of the electrical outlet you are using, contact your local powercompany.

If the power supply is broken, do not try to x it by yourself. Contact a qualied servicetechnician or your retailer.

Operation safety

Before installing the motherboard and adding devices on it, carefully read all the manuals

that came with the package.

Before using the product, make sure all cables are correctly connected and the powercables are not damaged. If you detect any damage, contact your dealer immediately.

To avoid short circuits, keep paper clips, screws, and staples away from connectors,slots, sockets and circuitry.

Avoid dust, humidity, and temperature extremes. Do not place the product in any areawhere it may become wet.

Place the product on a stable surface.

If you encounter technical problems with the product, contact a qualied servicetechnician or your retailer.

About this guideThis user guide contains the information you need when installing and conguring themotherboard.

How this guide is organized

This guide contains the following parts:

Chapter 1: Product introduction

This chapter describes the features of the motherboard and the new technology itsupports.

Chapter 2: BIOS setup

This chapter tells how to change system settings through the BIOS Setup menus.Detailed descriptions of the BIOS parameters are also provided.

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viii

Where to nd more information

Refer to the following sources for additional information and for product and softwareupdates.

1. ASUS websites

The ASUS website provides updated information on ASUS hardware and softwareproducts. Refer to the ASUS contact information.

2. Optional documentation

Your product package may include optional documentation, such as warranty yers,that may have been added by your dealer. These documents are not part of thestandard package.

Conventions used in this guide

To make sure that you perform certain tasks properly, take note of the following symbols used

throughout this manual.

DANGER/WARNING:Information to prevent injury to yourselfwhen trying to complete a task.

CAUTION:Information to prevent damage to the componentswhen trying to complete a task.

NOTE: Tips and additional information to help you complete atask.

IMPORTANT: Instructions that you MUST follow to complete atask.

Typography

Bold text Indicates a menu or an item to select.

Italics Used to emphasize a word or a phrase.

Keys enclosed in the less-than and greater-than sign means

that you must press the enclosed key.Example: means that you must press the Enter orReturn key.

++ If you must press two or more keys simultaneously, the keynames are linked with a plus sign (+).Example: ++

Command Means that you must type the command exactly as shown,then supply the required item or value enclosed in brackets.Example: At the DOS prompt, type the command line:afudos /i[lename]

afudos /iP5QLEPU.ROM

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ix

P5QL/EPU specications summary

CPU LGA775 Socket for IntelCore2 Extreme /Core2 Quad /Core2 Duo / PentiumDual-Core / CeleronDual-Core /Celeronprocessors

Supports Intel45nm multi-core CPU

Chipset Intel P43 / ICH10 with IntelFast Memory Access Technology

System bus 1600(O.C.)/1333/1066/800 MHz

Memory Dual-channel memory architecture- 4 x 240-pin DIMM sockets support unbuffered

non-ECC DDR2 1066/800/667MHz memory modules- Supports up to 16GB system memory

* Refer to www.asus.com or this user manual for the

Memory QVL (Qualied Vendors Lists)** Due to the memory address limitation on 32-bitWindows OS, when you install 4GB or more memory

on the motherboard, the actual usable memory for the OScan be about 3GB or less. For effective use of memory, werecommend that you install a 64-bit Windows OS whenhaving 4GB or more memory installed on the motherboard.

Expansion slots 1 x PCIe x16 slot2 x PCIe x1 slots3 x PCI slots

Storage Intel ICH10 southbridge supports:- 6 x Serial ATA 3.0Gb/s ports

JMB368 PATA controller supports:- 1 x UltraDMA 133/100/66 for up to 2 PATA devices

LAN Realtek 8111C, PCIe Gigabit LAN controllerfeaturing AI NET2

Audio VIA VT1708S, 8-channel High-Denition Audio CODEC- Supports Jack-detect and Multi-streaming- Optical S/PDIF Out port at back I/O

USB 12 x USB 2.0 ports (6 at mid-board, 6 at back panel)

ASUS unique features ASUS Power Saving Solution:

- ASUS EPU-LASUS AI Life Features:

- ASUS Express GateASUS EZ DIY:

- ASUS O.C. Prole- ASUS CrashFree BIOS 3- ASUS EZ Flash 2

(continued on the next page)

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x

P5QL/EPU specications summary

ASUS exclusiveoverclocking features

Precision Tweaker:- vCore: Adjustable CPU voltage at 50mv increment- vDIMM: 64-step DRAM voltage control

SFS (Stepless Frequency Selection):- FSB tuning from 133MHz to 600MHz at 1MHz

increment- Memory tuning from 667MHz to 1333MHz for DDR2- PCI Express frequency tuning from 100MHz to

160MHz at 1MHz increment

Overclocking protection:- ASUS C.P.R. (CPU Parameter Recall)

Other features ASUS MyLogo 2

Rear panel ports 1 x PS/2 keyboard port

1 x Optical S/PDIF Out port1 x LAN (RJ-45) port6 x USB 2.0/1.1 ports8-channel audio I/O ports1 x COM port1 x Parallel port

Internal connectors 3 x USB connectors support 6 additional USB ports1 x Floppy disk drive connector1 x IDE connector6 x Serial ATA connectors

1 x CPU / 1 x Chassis / 1 x Power fan connectors1 x S/PDIF Out header

1 x Chassis intrusion connector1 x Front panel audio connector1 x CD audio in connector1 x 24-pin ATX power connector1 x 4-pin ATX 12V power connector1 x System panel connector

BIOS features 8Mb Flash ROM, AMI BIOS, PnP, DMI 2.0, WfM 2.0,SM BIOS 2.3, ACPI 2.0a, ASUS EZ Flash 2,

ASUS CrashFree BIOS 3

Manageability WfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE

Accessories 1 x UltraDMA 133/100/66 cable1 x Serial ATA cable1 x I/O shieldUser Manual

Support DVD DriversASUS PC Probe IIASUS UpdateAnti-Virus software (OEM version)

Form factor ATX form factor: 12 in x 8 in (30.5 cm x 20.4 cm)

*Specifcations are subject to change without notice.

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ASUS P5QL/EPU 1-1

Chapter 1Product introduction

1.1 Welcome!

Thank you for buying an ASUSP5QL/EPU motherboard!

The motherboard delivers a host of new features and latest technologies, making it anotherstandout in the long line of ASUS quality motherboards!

Before you start installing the motherboard, and hardware devices on it, check the items inyour package with the list below.

1.2 Package contents

Check your motherboard package for the following items.

Motherboard ASUS P5QL/EPU motherboard

Cables 1 x Serial ATA cable1 x Ultra DMA 133/100/66 cable

Accessories 1 x I/O shield

Application DVD ASUS motherboard support DVD

Documentation User Manual

If any of the above items is damaged or missing, contact your retailer.

1.3 Special features

1.3.1 Product highlights

Green ASUS

This motherboard and its packaging comply with the European Unions Restriction on theuse of Hazardous Substances (RoHS). This is in line with the ASUS vision of creatingenvironment-friendly and recyclable products/packaging to safeguard consumers healthwhile minimizing the impact on the environment.

IntelCore2 Extreme / Core2 Quad /Core2 Duo CPU support

This motherboard supports the latest IntelCore2 processors in the LGA775 packageand Intelnext-generation 45nm multi-core processors. With the new IntelCore

microarchitecture technology and 1333/1066/800MHz FSB, the IntelCore2 processor isone of the most powerful and energy efcient CPUs in the world. See page 1-8 for details.

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1-2 Chapter 1: Product introduction

IntelP43 Chipset

The IntelP43 Express Chipset is designed to support dual-channel DDR21066/800/667MHz architecture, 1333/1066/800MHz Front Side Bus (FSB),

PCIe 2.0, and multi-core CPUs. It supports the IntelFast Memory Access technology that

signicantly optimizes the use of available memory bandwidth and reduces the latency of thememory accesses.

PCIe 2.0 support

This motherboard supports the latest PCIe 2.0 devices for double speed and bandwidthwhich enhances system performance.

FSB 1600 support (O.C.)ASUSs exclusive overclocking design now unleashes the ultimate potential of the IntelCore2 processor. With the new Intel 45nm micro-architecture technology and FSB 1600(O.

C.)/1333/1066/800MHz, this motherboard allows you to enjoy the latest technology supportedby one of the most powerful and energy efcient CPUs in the world.

Serial ATA 3Gb/s technology

This motherboard supports hard drives based on the Serial ATA (SATA) 3Gb/s storagespecications, delivering enhanced scalability and doubling the bus bandwidth for high-speeddata retrieval and save.

1.3.2 ASUS unique features

ASUS AI Life Features

Express Gate

Taking only 5 seconds to go online from bootup, Express Gate is the one-stop gatewayto instant fun! Its a unique motherboard built-in OS. You can utilize the most popular

Instant Messengers (IM) like MSN, Skype, Google talk, QQ, and Yahoo! Messengerto keep in touch with friends, or quickly check on the weather and e-mails just beforeleaving your house. Whats more, the user-friendly picture manager lets you view yourpictures without entering Windows at anytime!

The actual boot time depends on the system conguration.

ASUS Express Gate supports le uploading from SATA HDDs, ODDs and USB drivesand downloading to USB drives only.

ASUS Power Saving Solution

ASUS Power Saving solution intelligently and automatically provides balanced computingpower and energy consumption.

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ASUS P5QL/EPU 1-3

ASUS EPU

The ASUS unique power saving technology.

System power saving by detecting current PC loadings and intelligently moderating power inreal-time. Smart power saving without interrupting your work.

ASUS EZ DIY

ASUS EZ DIY feature collection provides you with easy ways to install computer components,update the BIOS or back up your favorite settings.

ASUS O.C. Prole

The motherboard features the ASUS O.C. Prole that allows users to convenientlystore or load multiple BIOS settings. The BIOS settings can be stored in the CMOS ora separate le, giving users freedom to share and distribute their favorite overclockingsettings. See page 2-24 for details.

ASUS CrashFree BIOS 3

The ASUS CrashFree BIOS 3 allows users to restore corrupted BIOS data from abootable oppy disk, a USB ash disk or the motherboard support DVD containing the

BIOS le. See page 2-5 for details.

ASUS EZ Flash 2

EZ Flash 2 is a user-friendly BIOS update utility. Simply launch this tool and updateBIOS from a USB ash disk before entering the OS. You can update your BIOS only in

a few clicks without preparing an additional oppy diskette or using an OS-based ashutility. See page 2-3 for details.

1.3.3 ASUS Stylish features

ASUS MyLogo2

This feature allows you to convert your favorite photo into a 256-color boot logo for a morecolorful and vivid image on your screen. See page 2-21 for details.

1.3.4 ASUS Intelligent Overclocking features

Precision Tweaker

This feature allows you to ne tune the CPU/memory voltage and gradually increase thememory Front Side Bus (FSB) and PCI Express frequency at 1MHz increment to achievemaximum system performance. See page 2-12 to 2-13 for details.

C.P.R. (CPU Parameter Recall)

The C.P.R. feature of the motherboard BIOS allows automatic re-setting to the BIOS defaultsettings in case the system hangs due to overclocking failure. When the system hangs dueto overclocking failure, C.P.R. eliminates the need to open the system chassis and clear theRTC data. Simply shut down and reboot the system, and the BIOS automatically restores theCPU default settings for each parameter.

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1.4 Before you proceed

Take note of the following precautions before you install motherboard components or change

any motherboard settings.

Unplug the power cord from the wall socket before touching any component.

Use a grounded wrist strap or touch a safely grounded object or a metal object, suchas the power supply case, before handling components to avoid damaging them due tostatic electricity.

Hold components by the edges to avoid touching the ICs on them.

Whenever you uninstall any component, place it on a grounded antistatic pad or in thebag that came with the component.

Before you install or remove any component, ensure that the ATX power supply is

switched off or the power cord is detached from the power supply. Failure to do so maycause severe damage to the motherboard, peripherals, and/or components.

Onboard LED

The motherboard comes with a standby power LED that lights up to indicate that thesystem is ON, in sleep mode, or in soft-off mode. This is a reminder that you must

shut down the system and unplug the power cable before removing or plugging in anymotherboard component. The illustration below shows the location of the onboard LED.

SB_PWR

ON

Standby Power Powered OffOFF

P5QL/EPU

P5QL/EPU Onboard LED

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ASUS P5QL/EPU 1-5

1.5 Motherboard overview

Before you install the motherboard, study the conguration of your chassis to ensure that the

motherboard ts into it.

Ensure that you unplug the power cord before installing or removing the motherboard.Failure to do so can cause you physical injury and damage motherboard components.

1.5.1 Placement direction

When installing the motherboard, make sure that you place it into the chassis in the correctorientation. The edge with external ports goes to the rear part of the chassis as indicated inthe image below.

1.5.2 Screw holes

Place six screws into the holes indicated by circles to secure the motherboard to the chassis.

Do not overtighten the screws! Doing so can damage the motherboard.

P5QL/EPU

Place this side towardsthe rear of the chassis

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1.5.3 Motherboard layout

P5QL/EPU

PCIEX16

PCIEX1_1

PCIEX1_2

PCI2

PCI3

PCI1

FLOPPY USB1112 USB78 USB910SPDIF_OUT

AAFP

CD

ATX12V

EATXPWR

CPU_

FAN

PWR_FAN

CHA_FAN

Lithium CellCMOS Power

Super

I/O

VIAVT1708S

Realtek

8111C

KBMS

SPDIF_O

8Mb

BIOS

JMB

368

SB_PWR

CLRTC

CHASSIS

20.3cm(8.0in)

Intel

ICH10

Intel

P43DDR2DIMM_

A1(64bit,240-pinmodule)

DDR2DIMM_

A2(64bit,240-pinmodule)

DDR2DIMM_

B1(64bit,24

0-pinmodule)

DDR2DIMM_

B2(64bit,24

0-pinmodule)

SATA1SATA2

SATA3SATA4

SATA5SATA6

AUDIO

LPT

COM1

LAN1_USB12

USB34

30.5cm(12.0in)

PRI_IDE

LGA775

PANEL

1 2

6

3

4

5

7

8

10 911121314

15

Refer to 1.10 Connectorsfor more information about rear panel ports and internalconnectors.

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ASUS P5QL/EPU 1-7

1.5.4 Layout contents

Connectors/Jumpers/Slots Page

1. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) 1-25

2. DDR2 DIMM slots 1-113. CPU, chassis, and power fan connectors

(4-pin CPU_FAN; 3-pin CHA_FAN1-3; 3-pin PWR_FAN)1-22

4. Clear RTC RAM (3-pin CLRTC) 1-18

5. Chassis intrusion connector (4-1 pin CHASSIS) 1-24

6. ICH10 Serial ATA connectors (7-pin SATA1-6) 1-22

7. System panel connector (20-8 pin PANEL) 1-26

8. Onboard LED 1-4

9. IDE connector (40-1 pin PRI_EIDE) 1-21

10. USB connectors (10-1 pin USB78, USB910 and USB1112) 1-2311. Floppy disk drive connector (34-1 pin FLOPPY) 1-20

12. Digital audio connector (4-1 pin SPDIF_OUT) 1-21

13. Front panel audio connector (10-1 pin AAFP) 1-24

14. Optical drive audio connector (4-pin CD) 1-23

15. LGA775 CPU Socket 1-8

1.6 Central Processing Unit (CPU)

The motherboard comes with a surface mount LGA775 socket designed for the IntelCore2 Extreme / Core2 Quad / Core2 Duo / PentiumDual-Core / CeleronDual-Core

/ Celeronprocessors.

Ensure that all power cables are unplugged before installing the CPU.

Connect the chassis fan cable to the CHA_FAN connector to ensure system stability.

Upon purchase of the motherboard, make sure that the PnP cap is on the socket andthe socket contacts are not bent. Contact your retailer immediately if the PnP capis missing, or if you see any damage to the PnP cap/socket contacts/motherboardcomponents. ASUS will shoulder the cost of repair only if the damage is shipment/transit-related.

Keep the cap after installing the motherboard. ASUS will process Return MerchandiseAuthorization (RMA) requests only if the motherboard comes with the cap on theLGA775 socket.

The product warranty does not cover damage to the socket contacts resulting fromincorrect CPU installation/removal, or misplacement/loss/incorrect removal of the PnP

cap.

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1.6.1 Installing the CPU

To install a CPU:

1. Locate the CPU socket on the motherboard.

P5QL/EPU

P5QL/EPU CPU socket 775

Before installing the CPU, ensure that the socket box is facing towards you and the loadlever is on your left.

To prevent damage to the socketpins, do not remove the PnP capunless you are installing a CPU.

2. Press the load lever with your thumb(A), then move it to the left (B) until it isreleased from the retention tab.

4. Lift the load plate with your thumb andforenger to a 100 angle (4A), then

push the PnP cap from the load platewindow to remove (4B).

3. Lift the load lever in the direction of thearrow to a 135 angle.

A

B

Load lever

Retention tab

Load plate

PnP cap

4A

4B

3

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ASUS P5QL/EPU 1-9

5. Position the CPU over the socket,ensuring that the gold triangle is on thebottom-left corner of the socket then tthe socket alignment key into the CPU

notch.

6. Apply several drops of Thermal InterfaceMaterial to the exposed area of the CPUthat the heatsink will be in contact with,ensuring that it is spread in an even thinlayer.

DO NOTeat the Thermal Interface Material. If it gets into your eyes or touches your skin,ensure that you wash it off immediately, and seek professional medical help.

Some heatsinks come with pre-

applied thermal paste. If so, skip thisstep.

To prevent contaminating the paste, DO NOTspread the paste with your nger directly.

7. Close the load plate (A), then pushthe load lever (B) until it snaps into theretention tab.

The motherboard supports IntelLGA775 processors with theIntelEnhanced Intel SpeedStep

Technology (EIST) and Hyper-Threading Technology. Refer to theAppendix for more information onthese CPU features.

Goldtriangle

mark

Alignment key

CPU notch

A

B

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1.6.2 Installing the CPU heatsink and fan

The IntelLGA775 processor requires a specially designed heatsink and fan assembly to

ensure optimum thermal condition and performance.

When you buy a boxed Intelprocessor, the package includes the CPU fan andheatsink assembly. If you buy a CPU separately, ensure that you use only Intel-certiedmulti-directional heatsink and fan.

Your IntelLGA775 heatsink and fan assembly comes in a push-pin design and requiresno tool to install.

If you purchased a separate CPU heatsink and fan assembly, make sure that you haveproperly applied Thermal Interface Material to the CPU heatsink or CPU before youinstall the heatsink and fan assembly.

Ensure that you have installed the motherboard to the chassis before you install the CPUfan and heatsink assembly.

The type of CPU heatsink and fan assembly may differ, but the installation steps andfucntions should remain the same. The illustration above is for reference only.

To install the CPU heatsink and fan:

1. Place the heatsink on top of the installedCPU, making sure that the four fastenersmatch the holes on the motherboard.

2. Push down two fasteners at a time in a

diagonal sequence to secure the heatsinkand fan assembly in place.

3. Connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN.

Do not forget to connectthe CPU fan connector!Hardware monitoring errorscan occur if you fail to plugthis connector.

CPU_FAN

GND

CPU FAN PWR

CPU FAN IN

CPU FAN PWM

P5QL/EPU

P5QL/EPU CPU fan connector

A

A

B

B

1

1

A B

B A

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1.6.3 Uninstalling the CPU heatsink and fan

To uninstall the CPU heatsink and fan

1. Disconnect the CPU fan cable fromthe connector on the motherboard.

2. Rotate each fastenercounterclockwise.

3. Pull up two fasteners at a time in

4. Carefully remove the heatsink and fan assembly from the motherboard.

1.7 System memory

1.7.1 Overview

The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules(DIMM) sockets.

The gure illustrates the location of the DDR2 DIMM sockets:

P5QL/EPU

P5QL/EPU 240-pin DDR2 DIMM sockets

DIMM_

A1

DIMM_

A2

DIMM_

B1

DIMM_

B2

Channel Sockets

Channel A DIMM_A1 and DIMM_A2

Channel B DIMM_B1 and DIMM_B2

A

A

BB

A

A B

B

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1.7.2 Memory congurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered non-ECC DDR2 DIMMs into theDIMM sockets.

Recommended Memory Congurations

ModeSockets

DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2

Single-Channel- - Populated -

Populated - - -

Dual-channel (1) Populated - Populated -

Dual-channel (2) Populated Populated Populated Populated

When using only one DDR2 DIMM, start installing it from DIMM_A1 or DIMM_B1 forbetter overclocking capability.

For dual-channel conguration (1), install two identical DIMMs in DIMM_A1 andDIMM_B1.

For dual-channel conguration (2), you can:

- install four identical DIMMs in all four slots; or

- install one identical DIMM pair in DIMM_A1 and DIMM_B1 (yellow slots) andanother identical DIMM pair in DIMM_A2 and DIMM_B2 (black slots).

Always install DIMMs with the same CAS latency. For optimum compatibility, it isrecommended that you obtain memory modules from the same vendor.

Due to the memory address limitation on 32-bit Windows OS, when you install 4GBor more memory on the motherboard, the actual usable memory for the OS can beabout 3GB or less. For effective use of memory, we recommend that you install a 64-bitWindows OS when having 4GB or more memory installed on the motherboard.

This motherboard supports up to 16GB on a WindowsXP Professional x64 andWindowsVista x64 Edition. You may install a maximum of 4GB DIMM on each slot.

The default memory operation frequency is dependent on its SPD. Under the defaultstate, some memory modules for overclocking may operate at a lower frequency thanthe vendor-marked value. To operate at the vendor-marked or at a higher frequency, seesection 2.4 Ai Tweaker menufor manual memory frequency adjustment.

For system stability, use a more efcient cooling system to support a full memory load (4DIMMs) or overclocking conditions.

Some old-version DDR2-800 DIMMs may not match Intels On-Die-Termination (ODT)requirement and will automatically downgrade to run at DDR2-667. If this happens,contact your memory vendor to check the ODT value.

Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run at DDR2-667by default setting. If you want to operate with lower latency, adjust the memory timingmanually.

This motherboard does not support DIMMs made up of 256 megabit (Mb) chips or less.

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ASUS P5QL/EPU 1-13

P5QL/EPU Motherboard Qualied Vendors Lists (QVL)

DDR2-1066MHz capability

If you install a DDR2-1066 memory module whose SPD is DDR2-800, ensure that you setthe DRAM Frequencyitem in the BIOS to [DDR2-1066MHz]. See section 2.4 Ai Tweakermenufor details.


(continued on the next page)

Size Vendor Part No. CLChip

Brand

SS/

DS

Chip No.DIMM support

A* B* C*

512MB Kingston KHX8500D2/512 N/A Kingston SS Heat-Sink Package

512MB Kingston KVR1066D2N7/512 N/A Elpida SS E5108AJBG-1J-E

1G Kingston KHX8500D2K2/1GN N/A Kingston DS Heat-Sink Package

1G Kingston KVR1066D2N7/1G N/A Elpida DS E5108AJBG-1J-E

1G Kingston KHX8500D2/1G N/A Kingston DS Heat-Sink Package

1G Qimonda HYS64T128020EU-19F-C 6 Qimonda DS HYB18T512800CF19FFSS24313

1G Kingmax KLED48F-A8K15 N/A Kingmax DS KKA8FFIXF-JFS-18A

1G Transcend TX1066QLJ-2GK1GB 5 Transced DS Heat-Sink Package

1G GEIL GB22GB8500C5DC 5 GEIL SS GL2L128M88BA25AB

1G GEIL GB24GB8500C5QC 5 GEIL SS GL2L128M88BA25AB

1G GEIL GE22GB1066C5DC 5 GEIL DS Heat-Sink Package

2G GEIL GB24GB8500C5DC 5 GEIL DS GL2L128M88BA25AB

512MB AENEON AXT660UD00-19DC97X 5 AENEON SS Heat-Sink Package

1G AENEON AXT760UD00-19DC97X 5 AENEON DS Heat-Sink Package

Size Vendor Part No. CL Chip BrandSS/DS


A* B* C*

1G Kingston KHX6400D2LL/1G N/A Kingston DS Heat-Sink Package

512MB Kingston KHX6400D2LLK2/1GN N/A Kingston SS Heat-Sink Package

512MB Kingston KVR800D2N5/512 N/A Promos SSV59C1512804QCF25SY032406PECPA

512MB Kingston KVR800D2N6/512 N/A Elpida SS E5108AJBG-8E-E

1G Kingston KVR800D2N5/1G N/A Elpida DS E5108AJBG-8E-E

1G Kingston KVR800D2N6/1G N/A Elpida DS E5108AJBG-8E-E

2G Kingston KVR800D2N5/2G N/A Elpida DS E1108ACBG-8E-E

4G Kingston N/A N/A Elpida DS E2108ABSE-8G-E

512MB Samsung M378T6553GZS-CF7 6 Samsung SS K4T51083QG-HCF7

1G Samsung M378T2863QZS-CF7 6 Samsung SS K4T1G084QQ-HCF7

1G Samsung M378T2953GZ3-CF7 6 Samsung DS K4T51083QG-HCF7

2G Samsung M37875663QZ3-CF7 6 Samsung DS K4T1G084QQ-HCF7

512MB Qimonda HYS64T64000EU-2.5-B2 6 Qimonda SS HYB18T512800B2F25FSS28380

1G Qimonda HYS64T128020EU-2.5-B2 6 Qimonda DS HYB18T512800B2F25FSS28380

1G Corsair XMS2-6400 4 Corsair DS Heat-Sink Package


512MB HY HYMP564U64CP8-S5 AB 5 Hynix SS HY5PS12821CFP-S5

1G HY HYMP512U64CP8-S5 AB 5 Hynix DS HY5PS12821CFPS5

512MB Kingmax KLDC28F-A8KI5 N/A Kingmax SS KKA8FF1XF-JFS-25A

1G Kingmax KLDD48F-A8K15 N/A Kingmax DS KKA8FFIXF-HFS-25A

512MB Apacer 78.91G91.9K5 5 Apacer SS AM4B5708JQJS8E0751C

1G Apacer 78.01GA0.9K5 5 Apacer SS AM4B5808CQJS8E0749D

2G Apacer 78.A1GA0.9K4 5 Apacer DS AM4B5808CQJS8E0747D

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A* B* C*

512MB Transcend TS128MLQ64V8J512MB N/A Micron SS 7HD22 D9GMH

512MB Transcend TS64MLQ64V8J512MB N/A Transcend SS Heat-Sink Package

512MB ADATA M2OAD6G3H3160Q1E58 N/A ADATA SS AD29608A8A-25EG80812

512MB VDATA M2GVD6G3H3160Q1E52 N/A VDATA SS VD29608A8A-25EG20813

1G ADATA M2OAD6G314170Q1E58 N/A ADATA DS AD29608A8A-25EG80810

1G VDATA M2GVD6G314170Q1E58 N/A VDATA DS VD29608A8A-25EG80813

1G PSC AL7E8F73C-8E1 5 PSC SS A3R1GE3CFF734MAA0E

2G PSC AL8E8F73C-8E1 5 PSC DS A3R1GE3CFF734MAA0E

1G GEIL GB22GB6400C4DC 4 GEIL DS GL2L64M088BA30EB

1G GEIL GB24GB6400C4QC 4 GEIL DS GL2L64M088BA30EB

1G GEIL GB22GB6400C5DC 5 GEIL DS GL2L64M088BA30EB

1G GEIL GB24GB6400C5QC 5 GEIL DS GL2L64M088BA30EB

1G GEIL GX22GB6400DC 5 GEIL DS Heat-Sink Package

1G GEIL GE22GB800C4DC 4 GEIL DS Heat-Sink Package 1G GEIL GE24GB800C4QC 4 GEIL DS Heat-Sink Package

1G GEIL GX22GB6400UDC 4 GEIL DS Heat-Sink Package


1G GEIL GE24GB800C5QC 5 GEIL DS Heat-Sink Package



2G GEIL GB28GB6400C5QC 5 GEIL DS GL2L128M88BA25AB

2G GEIL GB28GB6400C4QC 4 GEIL DS GL2L128M88BA25AB

2G GEIL GX22GB6400LX 5 GEIL DS Heat-Sink Package

2G GEIL GX24GB6400DC 5 GEIL DS Heat-Sink Package

2G GEIL GE28GB800C5QC 5 GEIL DS Heat-Sink Package

2G GEIL GE28GB800C4QC 4 GEIL DS Heat-Sink Package 2G GEIL GX22GB6400CUSC 4 GEIL DS Heat-Sink Package


1G Super Talent T800UB1GC4 4 Super Talent DS Heat-Sink Package

1G G.SKILL F2-6400CL5D-2GBNQ 5 G.SKILL DS Heat-Sink Package

1G G.SKILL F2-6400CL4D-2GBPK 4 G.SKILL DS Heat-Sink Package

1G G.SKILL F2-6400CL4D-2GBHK 4 G.SKILL DS Heat-Sink Package

2G G.SKILL F2-6400CL5D-4GBPQ 5 G.SKILL DS Heat-Sink Package

2G G.SKILL F2-6400CL4D-4GBPK 4 G.SKILL DS Heat-Sink Package

4G G.SKILL F2-6400CL5Q-16GNQ 5 G.SKILL DS Heat-Sink Package

1G OCZ OCZ2RPR8002GK 4 OCZ DS Heat-Sink Package

1G OCZ OCZ2G800R22GK 5 OCZ DS Heat-Sink Package

1G OCZ OCZ2P800R22GK 4 OCZ DS Heat-Sink Package

1G OCZ OCZ2VU8004GK 6 OCZ DS Heat-Sink Package

1G Elixir M2Y1G64TU8HB0B-25C 5 Elixir DS N2TU51280BE-25C802006Z1DV

512MB AENEON AET660UD00-25DB98X N/A AENEON SS AET93F25DB 0621

1G AENEON AET760UD00-25DB97X 5 AENEON DS AET93R25DB 0640

1G AENEON AET760UD00-25DC08X 5 AENEON SS AET03R250C 0732

2G AENEON AET860UD00-25DC08X 5 AENEON DS AET03R250C 0732

512MB MDT MDT 512MB 5 MDT SS 18D51280D-2.50726F

1G MDT MDT 1024MB 5 MDT DS 18D51280D-2.50726E

1G Century 28V0H8 5 Hynix DS HY5PS12821CFP-S5

512MB TAKEMS TMS51B264C081-805EP 5 takeMS SS MS18T51280-2.5P0710

1G TAKEMS TMS1GB264C081-805EP 5 takeMS DS MS18T51280-2.5P0716

1G ASINT SLY2128M8-JGE N/A ASINT SS DDRII1208-GE 8115

2G ASINT SLZ2128M8-JGE N/A ASINT DS DDRII1208-GE 8115

1G UMAX D48001GP3-63BJU N/A UMAX DS U2S12D30TP-8E

2G UMAX D48002GP0-73BCU 5 UMAX DS U2S24D30TP-8E

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SS - Single-sided / DS - Double - sidedDIMM support: A*:Supports one module inserted into any slot as Single-channel memory conguration. B*:Supports one pair of modules inserted into either the yellow slots or the black slots

as one pair of Dual-channel memory conguration. C*:Supports four modules inserted into both the yellow slots and the black slots as two

pairs of Dual-channel memory conguration.



A* B* C*

512MB Kingston KVR667D2N5/512 N/A Hynix SS HY5PS12821EFP-Y5

1G Kingston KVR667D2N5/1G N/A Hynix DS HY5PS12821EFP-Y5

2G Kingston KVR667D2N5/2G N/A Micron DS 7RE22 D9HNL

512MB Qimonda HYS64T64000EU-3S-B2 5 Qimonda SS HYB18T512B00B2F3SFSS28171 1G Qimonda HYS64T128020EU-3S-B2 5 Qimonda DS HYB18T512B00B2F3SFSS28171

512MB Corsair VS512MB667D2 N/A Corsair SS 64M8CFEGPS0900647

1G Corsair VS1GB667D2 N/A Corsair DS MID095D62864M8CEC


1G HY HYMP512U64CP8-Y5 AB 5 Hynix DS HY5PS12521CFP-Y5

512MB Kingmax KLCC28F-A8KB5 N/A Kingmax SS KKEA88B4LAUG-29DX

1G Kingmax KLCD48F-A8KB5 N/A Kingmax DS KKEA88B4LAUG-29DX

512MB Apacer AU512E667C5KBGC 5 Apacer SS AM4B5708MIJS7E0627B

512MB Apacer AU512E667C5KBGC 5 Apacer SS AM4B5708GQJS7E06332F

512MB Apacer 78.91G92.9K5 5 Apacer SS AM4B5708JQJS7E0751C

1G Apacer 78.01G9O.9K5 5 Apacer SS AM4B5808CQJS7E0751C

1G Apacer AU01GE667C5KBGC N/A Apacer DS AM4B5708GQJS7E0636B

1G Apacer AU01GE667C5KBGC 5 Apacer DS AM4B5708MIJS7E0627B

2G Apacer 78.A1G9O.9K4 5 Apacer DS AM4B5808CQJS7E0749B

1G Transcend 506010-4894 5 Elpida DS E5108AJBG-6E-E

512MB ADATA M2OAD5G3H3160Q1C52 N/A ADATA SS AD29608A8A-3EG20813

2G ADATA M2OAD5H3J4170I1C53 N/A ADATA DS AD20908A8A-3EG 30724

512MB PSC AL6E8E63J-6E1 5 PSC SS A3R12E3JFF717B9A00

1G PSC AL7E8E63J-6E1 5 PSC DS A3R12E3JFF717B9A01

1G PSC AL7E8F73C-6E1 5 PSC SS A3R1GE3CFF734MAA0J

2G PSC AL8E8F73C-6E1 5 PSC DS A3R1GE3CFF733MAA00

512MB Nanya NT512T64U88A1BY-3C N/A Nanya SS NT5TU64M8AE-3C

1G Nanya NT1GT64U8HB0BY-3C 5 Nanya DS NT5TU64M8BE-3C72155700CP

1G GEIL GX21GB5300SX 3 GEIL DS Heat-Sink Package

2G GEIL GX24GB5300LDC 5 GEIL DS Heat-Sink Package

1G Super Talent T667UB1GV 5 Super Talent DS PG 64M8-800 0750

512MB Twinmos 8D-A3JK5MPETP 5 PSC SS A3R12E3GEF633ACAOY

1G ELIXIR M2Y1G64TU8HA2B-3C 5 ELIXIR DS M2TU51280AE-3C717095R28F

1G ELIXIR M2Y1G64TU8HBOB-3C 5 ELIXIR DS N2TU51280BE-3C639009W1CF

1G Leadmax LRMP512U64A8-Y5 N/A Hynix DS HY5PS12821CFP-Y5 C 702AA

512MB MDT DDRII 512 PC667 4 MDT DS 18D51201D-30726E

1G MDT MDT 1024MB 4 MDT DS 18D51200D-30646

1G MDT MDT 1024MB 4 MDT DS 18D51280D-30646E

512MB AENEON AET660UD00-30DB97X 5 AENEON SS AET93R300B 0634

1G AENEON AET760UD00-30DB97X 5 AENEON DS AET93R300B 0639

512MB TAKEMS TMS51B264C081-665QI 5 takeMS SS MS18T51280-3

512MB TAKEMS TMS51B264C081-665AP 5 takeMS SS MS18T51280-3S0627D

1G TAKEMS TMS1GB264C081-665AE 5 takeMS DS MS18T51280-3SEA07100

512MB ASINT SLX264M8-J6E N/A ASINT SS DDRII6408-6E

1G ASINT SLY2128M8-J6E N/A ASINT SS DDRII1208-6E 8115

512MB Century CENTURY 512MB N/A Nanya SS NT5TU64M8AE-3C

512MB Century CENTURY 512MB N/A Hynix SS HY5PS12821AFP-Y5

1G Century CENTURY 1G N/A Hynix DS HY5PS12821AFP-Y5

1G UMAX D46701GP3-63BJU N/A UMAX DS U2S12D30YP-6E

2G UMAX D46702GP0-73BCU 5 UMAX DS U2S24D30TP-6E

512MB KINGBOX 512MB 667MHz N/A KINGBOX SS EPD264082200-4

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1.7.3 Installing a DIMM

Unplug the power supply before adding or removing DIMMs or other system components.Failure to do so can cause severe damage to both the motherboard and the components.

1. Unlock a DDR2 DIMMsocket by pressingthe retaining clipsoutward.

2. Align a DIMM on thesocket such that thenotch on the DIMM

matches the break on

A DDR2 DIMM is keyed with a notch so that it ts in only one direction. DO NOT force aDIMM into a socket to avoid damaging the DIMM.

3. Firmly insert the DIMM into the socket

until the retaining clips snap back in placeand the DIMM is properly seated.

1.7.4 Removing a DIMM

To remove a DIMM:

1. Simultaneously press the retaining clipsoutward to unlock the DIMM.

2. Remove the DIMM from the socket.

Support the DIMM lightly with yourngers when pressing the retainingclips. The DIMM might get damagedwhen it ips out with extra force.

Unlocked retaining clip

1

DDR2 DIMM notch

2

1

3

Locked Retaining Clip

DDR2 DIMM notch

1

2

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1.8 Expansion slots

In the future, you may need to install expansion cards. The following sub-sections describethe slots and the expansion cards that they support.

Ensure to unplug the power cord before adding or removing expansion cards. Failure to doso may cause you physical injury and damage motherboard components.

1.8.1 Installing an expansion card

To install an expansion card:

1. Before installing the expansion card, read the documentation that came with it andmake the necessary hardware settings for the card.

2. Remove the system unit cover (if your motherboard is already installed in a chassis).

3. Remove the bracket opposite the slot that you intend to use. Keep the screw for lateruse.

4. Align the card connector with the slot and press rmly until the card is completelyseated on the slot.

5. Secure the card to the chassis with the screw you removed earlier.

6. Replace the system cover.

1.8.2 Conguring an expansion cardAfter installing the expansion card, congure it by adjusting the software settings.

1. Turn on the system and change the necessary BIOS settings, if any. See Chapter 2 forinformation on BIOS setup.

2. Assign an IRQ to the card.

3. Install the software drivers for the expansion card.

When using PCI cards on shared slots, ensure that the drivers support Share IRQ or that

the cards do not need IRQ assignments. Otherwise, conicts will arise between the two PCIgroups, making the system unstable and the card inoperable. Refer to the table on the nextpage for details.

1.8.4 PCI slots

The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards thatcomply with PCI specications.

1.8.5 PCI Express x1 slots

This motherboard supports PCI Express x1 network cards, SCSI cards and other cards thatcomply with the PCI Express specications.

1.8.6 PCI Express x16 slot

This motherboard supports a PCI Express x16 graphics card that complies with the PCIExpress specications.

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1.9 Jumper

1. Clear RTC RAM (3-pin CLRTC)

This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You canclear the CMOS memory of date, time, and system setup parameters by erasingthe CMOS RTC RAM data. The onboard button cell battery powers the RAM data inCMOS, which include system setup information such as system passwords.

To erase the RTC RAM:

1. Turn OFF the computer and unplug the power cord.

2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3for about 5-10 seconds, then move the cap back to pins 1-2.

3. Plug the power cord and turn ON the computer.

4. Hold down the key during the boot process and enter BIOS setup to re-enterdata.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper defaultposition. Removing the cap will cause system boot failure!

If the steps above do not help, remove the onboard battery and move the jumper againto clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery.

You do not need to clear the RTC when the system hangs due to overclocking. Forsystem failure due to overclocking, use the CPU Parameter Recall (C.P.R.) feature. Shutdown and reboot the system, then the BIOS automatically resets parameter settings todefault values.

Due to the chipset limitation, AC power off is required before you use the C.P.R.function. You must turn off and on the power supply or unplug and plug the power cordbefore rebooting the system.

P5QL/EPU

P5QL/EPU Clear RTC RAM

1 2 2 3

Normal

(Default)

Clear RTC

CLRTC

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1.10 Connectors

1.10.1 Rear panel connectors

4 5 6 71 3

891114 10

2

1213

1. PS/2 keyboard port (purple). This port is for a PS/2 keyboard.

2. Parallel port.This 25-pin port connects a parallel printer, a scanner, or other devices.

3. LAN (RJ-45) port.Supported by Gigabit LAN controller, this port allows Gigabitconnection to a Local Area Network (LAN) through a network hub. Refer to the tablebelow for the LAN port LED indications.

LAN port LED indications

ACT/LINK LED SPEED LED

Status Description Status Description

OFF No link OFF 10 Mbps connection

YELLOW Linked ORANGE 100 Mbps connection

BLINKING Data activity GREEN 1 Gbps connection

SPEEDLED

ACT/LINKLED

LAN port

4. Center/Subwoofer port (orange).This port connects the center/subwoofer speakers.

5. Rear Speaker Out port (black).This port connects the rear speakers in a 4-channel,6-channel, or 8-channel audio conguration.

6. Line In port (light blue).This port connects the tape, CD, DVD player, or other audiosources.

7. Line Out port (lime).This port connects a headphone or a speaker. In 4-channel, 6-channel, and 8-channel conguration, the function of this port becomes Front SpeakerOut.

8. Microphone port (pink).This port connects a microphone.

9. Side Speaker Out port (gray).This port connects the side speakers in an 8-channelaudio conguration.

Refer to the audio conguration table on the next page for the function of the audio ports in2, 4, 6, or 8-channel conguration.

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Audio 2, 4, 6, or 8-channel conguration

PortHeadset

2-channel4-channel 6-channel 8-channel

Light Blue Line In Line In Line In Line In

Lime Line Out Front Speaker Out Front Speaker Out Front Speaker OutPink Mic In Mic In Mic In Mic In

Orange Center/Subwoofer Center/Subwoofer

Black Rear Speaker Out Rear Speaker Ou Rear Speaker Out

Gray Side Speaker Out

10. USB 2.0 ports 1 and 2.These two 4-pin Universal Serial Bus (USB) ports areavailable for connecting USB 2.0 devices.


12. COM port. This port is for pointing devices or other serial devices.

13. Optical S/PDIF Out port. This port connects an external audio output device via aoptical S/PDIF cable.


1.10.2 Internal connectors

1. Floppy disk drive connector (34-1 pin FLOPPY)This connector is for the oppy disk drive (FDD) signal cable. Insert one end of thecable to this connector, then connect the other end to the signal connector at the backof the oppy disk drive.

Pin 5 on the connector is removed to prevent incorrect cable connection when using aFDD cable with a covered Pin 5.

The FDD cable is purchased separately.

P5QL/EPU

P5QL/EPU Floppy disk drive connector

FLOPPY

NOTE:Orient the red markings

on the floppy ribbon cable to PIN 1.

PIN1

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2. Digital audio connector (4-1 pin SPDIF_OUT)

This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port. Connectthe S/PDIF Out module cable to this connector, then install the module to a slotopening at the back of the system chassis.

SPDIF_OUT

+5V

SPDIFOUT

GND

P5QL/EPU

P5QL/EPU Digital audio connector

The S/PDIF module is purchased separately.

3. IDE connector (40-1 pin PRI_EIDE)

The onboard IDE connector is for the Ultra DMA 133/100/66 signal cable. There arethree connectors on each Ultra DMA 133/100/66 signal cable: blue, black, and gray.Connect the blue connector to the motherboards IDE connector, then select one of the

following modes to congure your device.

Drive jumper setting Mode of device(s) Cable connector

Single device Cable-Select or Master - Black

Two devices

Cable-SelectMaster Black

Slave Gray

Master MasterBlack or gray

Slave Slave

Pin 20 on the IDE connector is removed to match the covered hole on the Ultra DMA

cable connector. This prevents incorrect insertion when you connect the IDE cable.

Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.

PRI_IDE

NOTE:Orient the red markingson the IDE ribbon cable to PIN 1.

PIN1

P5QL/EPU

P5QL/EPU IDE connector

If any device jumper is set asCable-Select, make sure all otherdevice jumpers have the samesetting.

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4. Serial ATA connectors (7-pin SATA1-6)

These connectors are for the Serial ATA signal cables for Serial ATA hard disk drives.

SATA1

GND

RSATA_

TXN1

RSATA_

TXP1

GND

RSATA_

RXN1

RSATA_

RXP1

GND

SATA2

GND

RSATA_

TXN2

RSATA_

TXP2

GND

RSATA_

RXN2

RSATA_

RXP2

GND

SATA3

GND

RSATA_

TXN3

RSATA_

TXP3

GND

RSATA_

RXN3

RSATA_

RXP3

GND

SATA4

GND

RSATA_

TXN4

RSATA_

TXP4

GND

RSATA_

RXN4

RSATA_

RXP4

GND

SATA5

GND

RSATA_

TXN5

RSATA_

TXP5

GND

RSATA_

RXN5

RSATA_

RXP5

GND

SATA6

GND

RSATA_

TXN6

RSATA_

TXP6

GND

RSATA_

RXN6

RSATA_

RXP6

GND

P5QL/EPU

P5QL/EPU SATA connectors

Connect the right-angle side of SATAsignal cable to SATA device. Or youmay connect the right-angle side ofSATA cable to the onboard SATAport to avoid mechanical conict withhuge graphics cards.

right-angle side

5. CPU, chassis, and power fan connectors

(4-pin CPU_FAN, 3-pin CHA_FAN, 3-pin PWR_FAN)

The fan connectors support cooling fans of 350 mA~2000 mA (24 W max.) or a totalof 1 A~7 A (84 W max.) at +12V. Connect the fan cables to the fan connectors on themotherboard, making sure that the black wire of each cable matches the ground pin ofthe connector.

Do not forget to connect the fan cables to the fan connectors. Insufcient air ow inside thesystem may damage the motherboard components. These are not jumpers! Do not placejumper caps on the fan connectors!

CPU_FAN

GND

CPU FAN PWR

CPU FAN IN

CPU FAN PWM

P5QL/EPU

P5QL/EPU fan connectors

PWR_FAN

GND

+12V

Rotation

CHA_FAN

GND

+12VRotation

Only the CPU fan supports the ASUS Q-FAN feature.

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ASUS P5QL/EPU 1-23

6. USB connectors (10-1 pin USB78, USB910, USB1112)

These connectors are for USB 2.0 ports. Connect the USB module cable to any ofthese connectors, then install the module to a slot opening at the back of the systemchassis. These USB connectors comply with USB 2.0 specication that supports up to

480 Mbps connection speed.

P5QL/EPU

P5QL/EPU USB2.0 connectors

PIN 1

USB+5V

USB_

P12-

USB_

P12+

GND

NC

USB+5V

USB_

P11-

USB_

P11+

GND

USB1112 USB78

PIN 1

USB+5V

USB_

P8-

USB_

P8+

GND

NC

USB+5V

USB_

P7-

USB_

P7+

GND

USB910

PIN 1

USB+5V

USB_

P10-

USB_

P10+

GND

NC

USB+5V

USB_

P9-

USB_

P9+

GND

Never connect a 1394 cable to the USB connectors. Doing so will damage themotherboard!

The USB module cable is purchased separately.

7. Optical drive audio connector (4-pin CD)

These connectors allow you to receive stereo audio input from sound sources such asa CD-ROM, TV tuner, or MPEG card.

CD

Right Audio Channel

GND

GND

Left Audio ChannelP5QL/EPU

P5QL/EPU Internal audio connector

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8. Front panel audio connector (10-1 pin AAFP)

This connector is for a chassis-mounted front panel audio I/O module that supportseither HD Audio or legacy AC`97 audio standard. Connect one end of the front panelaudio I/O module cable to this connector.

P5QL/EPU

P5QL/EPU Analog front panel connector

AAFPPIN 1

GND

PRESENCE#

SENSE1_

RETUR

SENSE2_

RETUR

PORT1L

PORT1R

PORT2R

SENSE_

SEND

PORT1L

HD-audio-compliant

pin definition

PIN 1

AGND

NCNC

NC

MIC2

MICPWR

Lineout_RNC

Lineout_L

Legacy AC97

compliant definition

We recommend that you connect a high-denition front panel audio module to thisconnector to avail of the motherboards high-denition audio capability.

If you want to connect a high-denition front panel audio module to this connector, setthe Front Panel Typeitem in the BIOS setup to [HD Audio]; if you want to connect anAC'97 front panel audio module to this connector, set the item to [AC97]. By default, thisconnector is set to [HD Audio].See section 2.5.3 Onboard Devices Congurationfordetails.

9. Chassis intrusion connector (4-1 pin CHASSIS)

This connector is for a chassis-mounted intrusion detection sensor or switch. Connectone end of the chassis intrusion sensor or switch cable to this connector. The chassisintrusion sensor or switch sends a high-level signal to this connector when a chassiscomponent is removed or replaced. The signal is then generated as a chassis intrusionevent.

By default, the pin labeled Chassis Signal and Ground are shorted with a jumpercap. Remove the jumper caps only when you intend to use the chassis intrusiondetection feature.

P5QL/EPU Chassis intrusion connector

P5QL/EPU

+5VSB_

MB

ChassisSignal

GND

CHASSIS

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10. ATX power connectors (24-pin EATXPWR, 4-pin EATX12V)

These connectors are for ATX power supply plugs. The power supply plugs aredesigned to t these connectors in only one orientation. Find the proper orientation andpush down rmly until the connectors completely t.

P5QL/EPU

P5QL/EPU ATX power connectors

EATXPWR

PIN 1

GND

+5 Volts

+5 Volts

+5 Volts

-5 Volts

GND

GND

GND

PSON#

GND

-12 Volts

+3 Volts

+3 Volts

+12 Volts

+12 Volts

+5V Standby

Power OK

GND

+5 Volts

GND

+5 Volts

GND

+3 Volts

+3 Volts

ATX12V

PIN 1

+12V

DC

+12V

DC

GND

GND

For a fully congured system, we recommend that you use a power supply unit (PSU)that complies with ATX 12 V Specication 2.0 (or later version) and provides a minimumpower of 400 W.

Do not forget to connect the 4-pin EATX12V power plug; otherwise, the system will notboot.

Use of a PSU with a higher power output is recommended when conguring a systemwith more power-consuming devices. The system may become unstable or may not boot

up if the power is inadequate.

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11. System panel connector (20-8 pin PANEL)

This connector supports several chassis-mounted functions.

P5QL/EPU System panel connector

PIN 1

* Requires an ATX power supply

PLED SPEAKER

PLED+

PLED-

+5V

Ground

Ground

Speake

r

IDE_

LED+

IDE_

LED-

PWR

Ground

Reset

Ground

PANEL

IDE_LED PWRSW RESET

P5QL/EPU

System power LED (2-pin PLED)

This 2-pin connector is for the system power LED. Connect the chassis power LEDcable to this connector. The system power LED lights up when you turn on the systempower, and blinks when the system is in sleep mode.

Hard disk drive activity LED (2-pin IDE_LED)

This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cableto this connector. The IDE LED lights up or ashes when data is read from or written tothe HDD.

System warning speaker (4-pin SPEAKER)This 4-pin connector is for the chassis-mounted system warning speaker. The speaker

allows you to hear system beeps and warnings.

ATX power button/soft-off button (2-pin PWRSW)

This connector is for the system power button. Pressing the power button turnsthe system on or puts the system in sleep or soft-off mode depending on the BIOSsettings. Pressing the power switch for more than four seconds while the system is ON

turns the system OFF.

Reset button (2-pin RESET)

This 2-pin connector is for the chassis-mounted reset button for system reboot withoutturning off the system power.

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1.11 Software support

1.11.1 Installing an operating system

This motherboard supports WindowsXP/Vista Operating Systems (OS). Always install the

latest OS version and corresponding updates to maximize the features of your hardware.

Motherboard settings and hardware options vary. Use the setup procedures presented inthis section for reference only. Refer to your OS documentation for detailed information.

Ensure that you install WindowsXP Service Pack 2 or later versions before installingthe drivers for better compatibility and system stability.

1.11.2 Support DVD information

The Support DVD that came with the motherboard package contains the drivers, softwareapplications, and utilities that you can install to avail all motherboard features.

To run the Support DVD

Place the Support DVD to the optical drive. The DVD automatically displays the Drivers menuif Autorun is enabled in your computer.

Click an item to install

Click an icon todisplay Support DVD/motherboard information

If Autorun is NOT enabled in your computer, browse the contents of the Support DVD tolocate the le ASSETUP.EXE from the BIN folder. Double-click the ASSETUP.EXE to runthe DVD.

The following screen is used for reference only.

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ASUS P5QL/EPU 2-1

Chapter 2BIOS information

2.1 Managing and updating your BIOS

The following utilities allow you to manage and update the motherboard Basic Input/OutputSystem (BIOS) setup.

1. ASUS Update:Updates the BIOS in Windowsenvironment.

2. ASUS EZ Flash 2:Updates the BIOS in DOS mode using a oppy disk or a USB ashdisk.

3. ASUS AFUDOS:Updates the BIOS in DOS mode using a bootable oppy disk.

4. ASUS CrashFree BIOS 3:Updates the BIOS using a oppy disk, a USB ash disk or

the motherboard support DVD when the BIOS le fails or gets corrupted.

Refer to the corresponding sections for details on these utilities.

Save a copy of the original motherboard BIOS le to a bootable oppy disk or a USB ashdisk in case you need to restore the BIOS in the future. Copy the original motherboardBIOS using the ASUS Update or AFUDOS utilities.

2.1.1 ASUS Update utility

The ASUS Update is a utility that allows you to manage, save, and update the motherboardBIOS in Windowsenvironment. The ASUS Update utility allows you to:

Save the current BIOS le

Download the latest BIOS le from the Internet

Update the BIOS from an updated BIOS le

Update the BIOS directly from the Internet, and

View the BIOS version information.

This utility is available in the support DVD that comes with the motherboard package.

ASUS Update requires an Internet connection either through a network or an InternetService Provider (ISP).

Installing ASUS Update

To install ASUS Update:

1. Place the support DVD in the optical drive. The Driversmenu appears.2. Click the Utilitiestab, then click Install ASUS Update.

3. The ASUS Update utility is copied to your system.

Quit all Windowsapplications before you update the BIOS using this utility.

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2-2 Chapter 2: BIOS setup

Updating the BIOS through the Internet

To update the BIOS through the Internet:

1. Launch the ASUS Update utility from the Windowsdesktop by clicking Start >

Programs > ASUS > ASUSUpdate > ASUSUpdate.

2. Select Update BIOSfrom the Internetfrom the drop-down menu, then click Next.

3. Select the ASUS FTP site nearest you to avoid network trafc, or click Auto Selectthen click Next.

4. From the FTP site, select the BIOS version that you wish to download then click Next.

5. Follow the screen instructions to complete the update process.

The ASUS Update utility is capable of updating itself through the Internet. Always updatethe utility to avail all its features.

Updating the BIOS through a BIOS le

To update the BIOS through a BIOS le:

1. Launch the ASUS Update utility from the Windowsdesktop by clicking Start >

Programs > ASUS > ASUSUpdate > ASUSUpdate.

2. Select Update BIOS from a le from the drop-down menu, then click Next.

3. Locate the BIOS le from the Open window, then click Open.

4. Follow the screen instructions to complete the update process.

2.1.2 Creating a bootable oppy disk

1. Do any one of the following to create a bootable oppy disk.

DOS environment

a. Insert a 1.44MB oppy disk into the drive.

b. At the DOS prompt, type format A:/Sthen press .

WindowsXP environment

a. Insert a 1.44 MB oppy disk to the oppy disk drive.

b. Click Startfrom the Windowsdesktop, then select My Computer.

c. Select the 3 1/2 Floppy Drive icon.

d. Click Filefrom the menu, then select Format. A Format 3 1/2 FloppyDiskwindow appears.

e. Select Create an MS-DOS startup diskfrom the format options eld,then click Start.

WindowsVista environment

a. Insert a formatted, high density 1.44 MB oppy disk to the oppy diskdrive.

b. Click from the Windowsdesktop, then select Computer.

c. Right-click Floppy Disk Drive then click Formatto display the

Format 3 1/2 Floppy dialog box.

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ASUS P5QL/EPU 2-3

d. Select the Create an MS-DOS startup diskcheck box.

e. Click Start.

2. Copy the original or the latest motherboard BIOS le to the bootable oppy disk.

2.1.3 ASUS EZ Flash 2 utilityThe ASUS EZ Flash 2 feature allows you to update the BIOS without having to go throughthe long process of booting from a oppy disk and using a DOS-based utility. The EZ Flash 2utility is built-in the BIOS chip so it is accessible by pressing + during the Power-On Self Tests (POST).

To update the BIOS using EZ Flash 2:

1. Visit the ASUS website at www.asus.com to download the latest BIOS le for thismotherboard.

2. Save the BIOS le to a oppy disk or a USB ash disk, then restart the system.

3. You can launch the EZ Flash 2 in two ways.

(1) Insert the oppy disk / USB ash disk that contains the BIOS le to the oppy diskdrive or the USB port.

Press + during POST to display the following.

ASUSTek EZ Flash 2 BIOS ROM Utility V3.24

Current ROM Update ROM

A:

Note

FLASH TYPE:MXIC 25L8005

PATH:A:\

BOARD: P5QL EPUVER: 0319 (H:00 B:03)

DATE: 12/03/2008

BOARD: UnknownVER: Unknown

DATE: Unknown

[Enter] Select or Load [Tab] Switch [V] Drive Info[Up/Down/Home/End] Move [B] Backup [ESC] Exit

(2) Enter BIOS setup program. Go to the Toolsmenu to select EZ Flash 2and pressto enable it.

You can switch between drives by pressing before the correct le is found.Then press .

4. When the correct BIOS le is found, EZ Flash 2 performs the BIOS update processand automatically reboots the system when done.

This function can support devices such as USB ash disk, or oppy disk with FAT 32/16format and single partition only.

Do not shut down or reset the system while updating the BIOS to prevent system bootfailure!

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2.1.4 AFUDOS utility

The AFUDOS utility allows you to update the BIOS le in DOS environment using a bootableoppy disk with the updated BIOS le. This utility also allows you to copy the current BIOSle that you can use as backup when the BIOS fails or gets corrupted during the updating

process.Copying the current BIOS

To copy the current BIOS le using the AFUDOS utility:

Make sure that the oppy disk is not write-protected and has at least 1024KB free spaceto save the le.

The succeeding BIOS screens are for reference only. The actual BIOS screen displaysmay not be the same as shown.

1. Copy the AFUDOS utility (afudos.exe) from the motherboard support DVD to abootable oppy disk.

2. Boot the system in DOS mode.

3. At the prompt key in afudos /o[lename]

where the [lename] is any user-assigned lename of not more than eightalphanumeric characters for the main lename and three alphanumeric characters forthe extension name.

Main lename Extension name

A:\>afudos /oOLDBIOS1.rom

then press to copy the current BIOS le to the oppy disk.

4. The utility returns to the DOS prompt after copying the current BIOS le.

Updating the BIOS le

To update the BIOS le using the AFUDOS utility:

1. Visit the ASUS website (www.asus.com) and download the latest BIOS le for the

motherboard. Save the BIOS le to a bootable oppy disk.

We recommend that you write the BIOS lename on a piece of paper; you will need to keyin the exact BIOS lename at the DOS prompt later.

2. Copy the AFUDOS utility (afudos.exe) from the motherboard support DVD to abootable oppy disk.

3. Boot the system in DOS mode.

4. At the prompt key in afudos /i[lename]

where [lename] is the latest or the original BIOS le in the bootable oppy disk.

A:\>afudos /iP5QLEPU.ROM

then press .

Do not shut down or reset the system while updating the BIOS to prevent system bootfailure!

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ASUS P5QL/EPU 2-5

5. The utility returns to the DOS prompt after the BIOS update process is completed.Reboot the system from the hard disk drive.

A:\>afudos /iP5QLEPU.ROMAMI Firmware Update Utility - Version 1.19(ASUS V2.07(03.11.24BB))Copyright (C) 2002 American Megatrends, Inc. All rights reserved.

WARNING!! Do not turn off power during ash BIOS Reading le ....... done

Reading ash ...... done

Advance Check ......

Erasing ash ...... done

Writing ash ...... done

Verifying ash .... done

Please restart your computer

A:\>

2.1.5 ASUS CrashFree BIOS 3 utilityThe ASUS CrashFree BIOS 3 is an auto recovery tool that allows you to restore theBIOS le when it fails or gets corrupted during the updating process. You can update acorrupted BIOS le using the motherboard support DVD, a oppy disk or a USB ashdisk that contains the updated BIOS le.

Prepare the motherboard support DVD, the oppy disk or the USB ash disk containingthe updated motherboard BIOS before using this utility.

Always connect the SATA cable to the SATA1 / SATA 2 connector; otherwise, the utilitywill not function.

Recovering the BIOS from a oppy disk

To recover the BIOS from a oppy disk:

1. Turn on the system.

2. Insert the oppy disk with the original or updated BIOS le to the oppy disk drive.

3. The utility displays the following message and automatically checks the oppy disk for

the original or updated BIOS le.

Bad BIOS checksum. Starting BIOS recovery...Checking for oppy...

When found, the utility reads the BIOS le and starts ashing the corrupted BIOS le.

Bad BIOS checksum. Starting BIOS recovery...Checking for oppy...Floppy found!Reading le P5QLEPU.ROM. Completed.Start ashing...

DO NOT shut down or reset the system while updating the BIOS! Doing so can causesystem boot failure!

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4. Restart the system after the utility completes the updating process.

Recovering the BIOS from the support DVD

To recover the BIOS from the support DVD:1. Turn on the system.

2. Insert the motherboard support DVD to the optical drive.

3. The utility displays the following message and automatically checks the DVD for theBIOS le.

Bad BIOS checksum. Starting BIOS recovery...Checking for oppy...

If no oppy disk is found, the utility automatically checks the optical drive for theoriginal or updated BIOS le. The utility then updates the corrupted BIOS le.

Bad BIOS checksum. Starting BIOS recovery...Checking for oppy...Floppy not found!Checking for DVD-ROM...DVD-ROM found!Reading le P5QLEPU.ROM. Completed.Start ashing...


The recovered BIOS may not be the latest BIOS version for this motherboard. Visit theASUS website (www.asus.com) to download the latest BIOS le.

Recovering the BIOS from a USB ash disk

To recover the BIOS from a USB ash disk:

1. Insert a USB ash disk that contains BIOS le to the USB port.

2. Turn on the system.

3. The utility will automatically checks the devices for the BIOS le When found, the utilityreads the BIOS le and starts ashing the corrupted BIOS le.


Only the USB ash disk with FAT 32/16 format and single partition can support ASUSCrashFree BIOS 3. The device size should be smaller than 8GB.

DO NOT shut down or reset the system while updating the BIOS! Doing so can causesystem boot failure!

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ASUS P5QL/EPU 2-7

2.2 BIOS setup program

This motherboard supports a programmable Serial Peripheral Interface (SPI) chip that you

can update using the provided utility described in section 2.1 Managing and updating yourBIOS.

Use the BIOS Setup program when you are installing a motherboard, reconguring yoursystem, or prompted to Run Setup. This section explains how to congure your systemusing this utility.

Even if you are not prompted to use the Setup program, you can change the conguration ofyour computer in the future. For example, you can enable the security password feature orchange the power management settings. This requires you to recongure your system using

the BIOS Setup program so that the computer can recognize these changes and record themin the CMOS RAM of the SPI chip.

The SPI chip on the motherboard stores the Setup utility. When you start up the computer,the system provides you with the opportunity to run this program. Press during thePower-On Self-Test (POST) to enter the Setup utility; otherwise, POST continues with its testroutines.

If you wish to enter Setup after POST, reboot the system by doing any of the followingprocedures:

Restart using the OS standard shut-down procedure.

Press ++simultaneously.

Press the reset button on the system chassis.

Press the power button to turn the system off then back on.

Using the power button, reset button, or the++keys to force reset froma running operating system can cause damage to your data or system. We recommend toalways shut-down the system properly from the operating system.

The Setup program is designed to make it as easy to use as possible. Being a menu-drivenprogram, it lets you scroll through the various sub-menus and make your selections from theavailable options using the navigation keys.

The default BIOS settings for this motherboard apply for most conditions to ensureoptimum performance. If the system becomes unstable after changing any BIOSsettings, load the default settings to ensure system compatibility and stability. Select theLoad Setups Defaultitem under the Exit Menu. See section 2.9 Exit Menu.

The BIOS setup screens shown in this section are for reference purposes only, and maynot exactly match what you see on your screen.

Visit the ASUS website at www.asus.com to download the latest BIOS le for thismotherboard.

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2.2.1 BIOS menu screen

Select Screen Select Item

+- Change FieldTab Select Field

F1 General HelpF10 Save and ExitESC Exit

v02.61 (C)Copyright 1985-2008, American Megatrends, Inc.

BIOS SETUP UTILITYMain Ai Tweaker Advanced Power Boot Tools Exit

System Time [14:14:35]System Date [Wed 04/16/2008]Legacy Diskette A [1.44M, 3.5 in.]

SATA 1 :[Not Detected]SATA 2 :[Not Detected]SATA 3 :[Not Detected]SATA 4 :[Not Detected] SATA 5 :[Not Detected]SATA 6 :[Not Detected]

Storage Conguration

System Information

Use [ENTER], [TAB] or[SHIFT-TAB] to selecta eld.

Use [+] or [-] tocongure system Time.

Navigation keys

General helpMenu bar

Sub-menu items

Conguration eldsMenu items

2.2.2 Menu bar

The menu bar on top of the screen has the following main items:

Main For changing the basic system congurationAi Tweaker For conguring system performance settings

Advanced For changing the advanced system settings

Power For changing the advanced power management (APM) conguration

Boot For changing the system boot conguration

Tools For conguring options for special functions

Exit For selecting the exit options and loading default settings.

To select an item on the menu bar, press the right or left arrow key on the keyboard until thedesired item is highlighted.

2.2.3 Navigation keys

At the bottom right corner of a menu screen are the navigation keys for that particular menu.

Use the navigation keys to select items in the menu and change the settings.

Some of the navigation keys differ from one screen to another.

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2.2.4 Menu items

The highlighted item on the menubar displays the specic items forthat menu. For example, selecting

Main shows the Main menu items.The other items (Ai Tweaker,Advanced, Power, Boot, and Exit) onthe menu bar have their respectivemenu items.

2.2.5 Sub-menu items

A solid triangle before each item on any menu screen means that the iteam has a sub-menu.

To display the sub-menu, select the item and press .

2.2.6 Conguration elds

These elds show the values for the menu items. If an item is user- congurable, you canchange the value of the eld opposite the item. You cannot select an item that is not user-congurable.

A congurable eld is enclosed in brackets, and is highlighted when selected. To change thevalue of a eld, select it then press to display a list of options. Refer to 2.2.7 Pop-upwindow.


+- Change FieldTab Select FieldF1 General HelpF10 Save and ExitESC Exit

v02.61 (C)Copyright 1985-200 8, Am er ic an Megatrends, Inc.


System Time [14:14:35]System Date [Wed 04/16/2008]Legacy Diskette A [1.44M, 3.5 in]

SATA 1 [Not Detected]SATA 2 [Not Detected]SATA 3 [Not Detected]SATA 4 [Not Detected] SATA 5 [Not Detected]SATA 6 [Not Detected]

Storage Conguration

System Information

[ENTER] to selectoppy type.

OptionsDisabled720K, 3.5 in.1.44M, 3.5 in.

Pop-up window

Scroll bar

2.2.7 Pop-up window

Select a menu item then pressto display a pop-upwindow with the congurationoptions for that item.

2.2.8 Scroll bar

A scroll bar appears on the rightside of a menu screen when

there are items that do not t onthe screen. Press the / arrow keys or /keys todisplay the other items on the screen.

2.2.9 General help

At the top right corner of the menu screen is a brief description of the selected item.

Main menu items


+- Change FieldTab Select FieldF1 General HelpF10 Save and ExitESC Exit

v02.61 (C)Copyright 1985-2008, American Megatrends, Inc.


System Time [14:14:35]System Date [Wed 04/16/2008]Legacy Diskette A [1.44M, 3.5 in.]

SATA 1 [Not Detected]SATA 2 [Not Detected]SATA 3 [Not Detected]SATA 4 [Not Detected]

SATA 5 [Not Detected]SATA 6 [Not Detected]

Storage Conguration

System Information

Use [ENTER], [TAB] or[SHIFT-TAB] to selecta eld.

Use [+] or [-] to

congure systemTime.

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2.3 Main menu

When you enter the BIOS Setup program, the Mainmenu screen appears, giving you anoverview of the basic system information.

Refer to section 2.2.1 BIOS menu screenfor information on the menu screen items andhow to navigate through them.


+- Change FieldTab Select FieldF1 Gene

e4277_p5ql-epu.pdf

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